noun, Electricity. 1. a circuit without interruption, providing a continuous path through which a current can flow. noun 1. a complete electrical circuit through which current can flow when a voltage is applied Compare open circuit closed circuit

closed circuit method n. A method for measuring oxygen consumption in which an initial quantity of oxygen is rebreathed through a carbon dioxide absorber and any decrease in the volume of oxygen taken in is noted.

noun 1. a system of televising by cable to designated viewing sets, as within a factory for monitoring production operations, in a theater for viewing a special event taking place elsewhere, or in an office building as an aid to maintaining security.

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